Original research · Published 30 May 2026
The Deposit Treadmill
How long it actually takes to save a 20% home deposit across five of Greater Western Sydney's first-home-buyer suburbs — once you account for the fact that prices keep moving while you save — computed from ~2.2 million NSW Government sale records.
The finding. In 4 of 5 suburbs, a household saving $2,000/month can never catch a 20% deposit on the median house — the price rises faster than the savings accumulate. But the median unit stays within reach in every one of them (under 5 to ~8 years), because unit growth has been far milder. And in one suburb — Parramatta — both houses and units are correcting, so the deposit target is actually falling. The honest first-home story in these suburbs is “buy the unit, not the house” — and the maths is below.
Units — within reach
Units are where first home buyers actually buy in these suburbs, and unit growth has been far milder than house growth. At a $2,000/month savings rate, a 20% unit deposit is reachable in roughly four-and-a-half to eight years across all five — and in Parramatta the unit market is correcting, so the target is falling.
| Suburb | Median | Sales | 12-mo growth | 20% deposit | Years to save* |
|---|---|---|---|---|---|
| Blacktown | $530,000 | 891 | +1.0% | $106,000 | 4.6 yrs |
| Liverpool | $515,500 | 1,626 | +3.1% | $103,100 | 5.0 yrs |
| Penrith | $600,000 | 1,042 | +6.2% | $120,000 | 8.2 yrs |
| Campbelltown | $565,000 | 430 | +6.6% | $113,000 | 7.7 yrs |
| Parramatta | $615,000 | 1,845 | -7.5% | $123,000 | 5.1 yrs |
Houses — the treadmill
Houses tell the opposite story. With 12-month house growth of +6% to +14% across four of the five suburbs, the 20% deposit target rises faster than a $2,000/month saver can close it — so the model returns “Never”. The lone exception runs the other way: Parramatta houses are down ~10%, so the target is falling and the deposit is becoming moreachievable while the market corrects.
| Suburb | Median | Sales | 12-mo growth | 20% deposit | Years to save* |
|---|---|---|---|---|---|
| Blacktown | $1,128,000 | 1,008 | +6.4% | $225,600 | Never* |
| Campbelltown | $980,000 | 413 | +7.7% | $196,000 | Never* |
| Liverpool | $1,230,000 | 233 | +11.8% | $246,000 | Never* |
| Penrith | $1,080,000 | 277 | +14.2% | $216,000 | Never* |
| Parramatta | $1,672,000 | 111 | -10.1% | $334,400 | 13.9 yrs |
*Years to save a 20% deposit at $2,000/month with no investment return assumed, where the deposit target grows at the suburb's 12-month price-growth rate. “Never” means the target recedes faster than savings accumulate within an 80-year horizon. This is a model output under a stated assumption, not a forecast or financial advice — see limitations below.
Methodology
Every figure here is computed directly from the NSW Valuer-General Property Sales Information — roughly 2.2 million transaction-level sale records published by the NSW Government — not from an aggregator estimate. We take residence sales over the 12 months to February 2026, apply a $50,000 floor to drop nominal transfers, classify each sale as a house or unit by strata title (strata = unit), and compute the median, the sale count, and the 12-month growth (current vs prior-12-month median) per suburb. The pipeline is open and reproducible (scripts/vg-suburb-medians.mjs). These government medians sit within about 2% of the aggregator figures shown on our suburb affordability pages; we use the government figures here so every number is first-party and verifiable.
A note on data quality. We cross-checked the government medians against three commercial property-data providers before publishing. They agreed closely on most figures; where a provider returned a value that was unavailable, implausible, or reported missing data as zero, we set it aside and relied on the government records as the source of truth.
The treadmill model. The 20% deposit target is not static — it grows at the suburb's price-growth rate. We find the first point where cumulative savings ($2,000/month, no investment return) meet that rising target. Where the target grows faster than savings accumulate, there is no such point — the deposit is a receding target. This corrects the common “X years to save” figure, which assumes a fixed target and materially overstates affordability in high-growth suburbs.
What this does not prove
- It is not financial advice, and the “years” figure is a model output, not a forecast.
- The $2,000/month savings rate is a single illustrative assumption. Higher savings (or investment returns on the growing balance, which we conservatively ignore) shorten the timeline; lower savings lengthen it.
- 12-month growth rates are volatile and not a prediction of future growth — recent double-digit rates are unlikely to persist indefinitely, and the Parramatta correction may not. The model shows what happens if a given rate continues, not that it will.
- It ignores income growth, government schemes (the 5% Deposit Scheme and First Home Super Saver Scheme change the deposit needed), and individual circumstances. Use our deposit tracker for your own numbers.
Cite this
NestPath (2026). The Deposit Treadmill: How Long to Save a Home Deposit Across Sydney's First-Home-Buyer Suburbs. Retrieved from https://nestpath.com.au/research/au-deposit-treadmill-2026. Licensed CC BY 4.0 — free to reuse with attribution.
Related
- FHB affordability by suburb — median, stamp duty and deposit per suburb.
- Deposit tracker — model your own savings timeline.
- How to save for a house deposit.